>       #3
I would suggest that you install linux-oem-5.10 
(https://launchpad.net/ubuntu/+source/linux-oem-5.10) and see if this persists. 
This is the kernel shipping with the "newer" models and has an updated graphics 
driver.

Will try this, thanks.

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https://bugs.launchpad.net/bugs/1915188

Title:
  Secondary monitor enters power save mode for no apparent reason

Status in Dell Sputnik:
  New
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  My secondary monitor has a tendency to enter power save mode for no apparent 
reason while my laptop is in use; unplugging and replugging my dock from the 
laptop seems to bring it back but sometimes requires a few tries. Doesn't seem 
to be any of:
  - after a predictable period of time
  - after inactivity

  Laptop: Dell XPS 13 9300, running Focal
  Dock: Dell WD19TB. Recently updated; current dock version per fwupdmgr is 
01.00.00.04; thunderbolt controller is 43.00; MST controller VMM5331 is 05.04.03

  Monitor: Dell P2715Q

  Not sure what logs would be useful, but happy to gather those as requested.
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu27.16
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  ismith     3753 F.... pulseaudio
   /dev/snd/controlC1:  ismith     3753 F.... pulseaudio
   /dev/snd/controlC0:  ismith     3753 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 20.04
  InstallationDate: Installed on 2020-08-09 (184 days ago)
  InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  MachineType: Dell Inc. XPS 13 9300
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.8.0-41-generic 
root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 5.8.0-41.46~20.04.1-generic 5.8.18
  RelatedPackageVersions:
   linux-restricted-modules-5.8.0-41-generic N/A
   linux-backports-modules-5.8.0-41-generic  N/A
   linux-firmware                            1.187.9
  Tags:  focal
  Uname: Linux 5.8.0-41-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip docker lpadmin lxd plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 01/17/2020
  dmi.bios.release: 1.0
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.0.6
  dmi.board.name: 0WX9VX
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.0.6:bd01/17/2020:br1.0:svnDellInc.:pnXPS139300:pvr:rvnDellInc.:rn0WX9VX:rvrA00:cvnDellInc.:ct10:cvr:
  dmi.product.family: XPS
  dmi.product.name: XPS 13 9300
  dmi.product.sku: 096D
  dmi.sys.vendor: Dell Inc.

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